title: [Simple refractometer for determination of visual acuity].
mesh_terms: D006801:Humans; D009885:Ophthalmology / Q000295:instrumentation*; D012030:Refractive Errors; D012031:Refractometry; D014792:Visual Acuity
keywords: OPHTHALMOLOGY/apparatus and instruments; REFRACTIVE ERRORS
vernacular_title: Enkel refraktor för synskärpebestämning.